Abstract
Magnetic field strengths and directions of the lines of force have been measured over two large sunspots in 1975 and 1976 using Treanor's method. Further refinements in observational technique reduce the effects of instrumental polarization to a small phase change, and the reduction procedure has been made more objective. The new observations confirm the existence of differences between the polarization states of the red and violet Zeeman σ-components in some regions of the spots. These differences, which are especially associated with light bridges and streamers, are attributed to magneto-optical effects, coupled with Doppler shifts, in extraneous material lying over the spots.
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